CN116298025A

CN116298025A - Intelligent eluent supply system of ion chromatograph

Info

Publication number: CN116298025A
Application number: CN202310065533.7A
Authority: CN
Inventors: 刘良; 李�浩; 商荣宁; 朱恒
Original assignee: Dehe Chuangrui Scientific Instruments Qingdao Co ltd
Current assignee: Dehe Chuangrui Scientific Instruments Qingdao Co ltd
Priority date: 2023-01-15
Filing date: 2023-01-15
Publication date: 2023-06-23

Abstract

The invention discloses an intelligent eluent supply system of an ion chromatograph, which comprises an eluent bottle, an automatic flow path switching device, an on-line gas-liquid separator, an eluent preheating device and a pump which are sequentially connected through pipelines; the leacheate detection and early warning device is arranged on the pipeline side between the automatic flow path switching device and the on-line gas-liquid separator; the supply system further includes a controller; the leacheate detection and early warning device is a capacitive proximity switch, a photoelectric bubble sensor or an ultrasonic bubble detection sensor. According to the invention, through the innovatively designed intelligent eluent supply system, automatic detection of eluent storage in the ion chromatograph is realized, the device is automatically screened when the eluent is absent, and the system automatically enters a protection state. The device avoids the subsequent problem of instrument eluent deficiency caused by human misoperation, so that the instrument operation is simpler, the data is more accurate, and the service life of the ion chromatograph is prolonged.

Description

Intelligent eluent supply system of ion chromatograph

Technical Field

The invention relates to an intelligent eluent supply system of an ion chromatograph.

Background

Ion chromatography is one type of high performance liquid chromatography and is therefore also known as High Performance Ion Chromatography (HPIC) or modern ion chromatography. The existing ion chromatograph cannot detect the defects of the leacheate in the instrument pipeline automatically, the defects of the leacheate can cause various abnormal phenomena of the instrument, the accuracy of instrument data is further affected, and the service life of the instrument is affected seriously.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a novel leacheate supply system.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

an intelligent eluent supply system of an ion chromatograph comprises an eluent bottle, an automatic flow path switching device, an on-line gas-liquid separator, an eluent preheating device and a pump which are sequentially connected through an eluent pipeline; the leacheate pipeline side between the automatic flow path switching device and the on-line gas-liquid separator is provided with a leacheate detection and early warning device; the liquid inlet side of the automatic flow path switching device is also connected with pure water, and the automatic flow path switching device is communicated with the leaching liquid bottle by default and can be controlled to be switched into communication with the pure water when needed; the automatic flow path switching device, the leacheate detection and early warning device, the leacheate preheating device and the pump are connected with a controller of the ion chromatograph; the leacheate detection and early warning device is a capacitive proximity switch, a photoelectric bubble sensor or an ultrasonic bubble detection sensor.

Furthermore, the eluent detection and early warning device is a capacitive proximity switch, and the capacitive proximity switch senses the existence of the eluent by sensing the change of dielectric constant caused by the approach of the eluent. The measuring head of the capacitive proximity switch is usually one polar plate forming a capacitor, and the other polar plate is the object, when the object moves towards the proximity switch, the dielectric constants of the object and the proximity switch change, so that the state of a circuit connected with the measuring head also changes, and the on and off of the switch can be controlled. The capacitive proximity switch can detect metallic conductors, insulating liquids or powdery objects, in this case for detecting the proximity and presence of liquids.

Further, the leacheate detection early warning device is a photoelectric bubble sensor, a detected leacheate pipeline is positioned in the middle of the photoelectric bubble sensor, the existence of liquid in the leacheate pipeline and the existence of bubbles generate different induction current at the base electrode of the photoelectric triode at the rear end, and the existence of liquid in the leacheate pipeline and the existence of bubbles are judged through the processing of the controller. The base electrode of the photoelectric triode generates different induction current, and different voltage drops, namely output voltages, are generated on the resistor at the lower end of the triode, and whether the liquid in the leaching liquid pipeline exists or not and whether bubbles exist or not are judged according to the output voltages.

Furthermore, the leacheate detection and early warning device is an ultrasonic bubble detection sensor, and the ultrasonic bubble detection sensor utilizes the fact that acoustic impedances of ultrasonic waves in liquid and gas are different, so that identification and detection of bubbles or liquid are achieved. The ultrasonic bubble detector utilizing the special packaging technology has the advantages of long service life, high sensitivity, high response speed and the like.

Furthermore, the leaching liquid pipeline is a polytetrafluoroethylene pipeline, and the pipeline is characterized by transparency, stable material and long service life.

Further, the controller judges that the ion chromatograph normally operates when the leacheate pipeline is full of liquid according to signal feedback of the leacheate detection and early warning device; when judging that the liquid in the leaching liquid pipeline is absent or bubbles are detected, the controller controls the automatic alarm and controls the ion chromatograph to automatically enter a protection state. At this time, the online gas-liquid separator still has liquid, can satisfy the instrument and continue to operate for a period of time, reserve the time for the user to replenish the solution, if the user does not replenish in time, will protect to shut down beyond a certain time, if the user has replenished in time, can realize not shutting down. After a delay of a few minutes, if the eluent in the eluent pipeline is not recovered to be normal, the controller automatically stops the operation of the pump and the eluent preheating device and stops the power supply to the inhibitor of the ion chromatograph, thereby playing a role in protecting the instrument.

Further, when the controller controls automatic alarming, the alarming indicator lamp flashes and gives out an alarm sound of dripping.

The beneficial effects of the invention are as follows: according to the invention, through the innovatively designed intelligent leacheate supply system, the automatic detection of the presence of the leacheate in the ion chromatograph is realized, the device is automatically screened when the leacheate is absent, and the system automatically enters a protection state, so that the operation of the instrument is more convenient and easier, the maintenance is easier, and the accuracy of analysis data and the service life of the instrument are improved. The eluting solution supply system eliminates the subsequent problem of instrument eluting solution deficiency caused by human misoperation, so that the instrument operation is simpler, the data is more accurate, and the service life of the ion chromatograph is prolonged.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic diagram of the principle of operation of the capacitive proximity switch of the present invention;

FIG. 3 is a schematic diagram of the working principle of the photoelectric bubble sensor of the invention;

FIG. 4 is a schematic diagram of an embodiment on-line gas-liquid separator;

reference numerals in the figures: 1-liquid inlet, 2-liquid outlet, 3-air outlet and 4-liquid level.

Detailed Description

The present invention will be described in further detail with reference to examples, and an intelligent eluent supply system for ion chromatograph is shown in fig. 1.

Embodiment 1, the supply system comprises an eluent bottle, an automatic flow path switching device, an online gas-liquid separator, an eluent preheating device and a pump which are sequentially connected through an eluent pipeline; the leacheate detection and early warning device is arranged on the pipeline side between the automatic flow path switching device and the on-line gas-liquid separator; the liquid inlet side of the automatic flow path switching device is also connected with pure water, and the automatic flow path switching device is communicated with the leaching liquid bottle by default and can be controlled to be switched into communication with the pure water when needed; the automatic flow path switching device, the leacheate detection and early warning device, the leacheate preheating device and the pump are connected with a controller of the ion chromatograph; the eluting solution pipeline is a pipeline made of polytetrafluoroethylene, and the eluting solution detection and early warning device is a capacitive proximity switch, as shown in fig. 2, and the capacitive proximity switch judges the existence of the eluting solution by sensing the change of dielectric constant caused by the approach of the eluting solution.

In example 2, similar to the supply system of example 1, the supply system is provided with a photoelectric bubble sensor, and as shown in fig. 3, the detected eluent line is located at the middle position of the photoelectric bubble sensor, and the presence or absence of liquid in the eluent line and the presence or absence of bubbles generate different induced current magnitudes at the base of the phototransistor at the rear end, and the presence or absence of liquid in the eluent line and the presence or absence of bubbles are determined by the controller.

In

embodiments

1 and 2, the controller controls the automatic alarm and controls the ion chromatograph to automatically enter a protection state when the liquid in the leacheate pipeline is judged to be absent or bubbles are detected. At the moment, the online gas-liquid separator is internally provided with the eluent, so that the continuous operation of the instrument for a period of time can be met, the time for replenishing the solution to the user is reserved, and if the solution is timely replenished by the user, the machine can be stopped; after the time delay of 8 minutes, if the leacheate in the leacheate pipeline is not recovered to be normal, the controller automatically stops the operation of the pump and the leacheate preheating device and stops the power on of the inhibitor, thereby playing a role in protecting the instrument; when the controller controls automatic alarming, the alarming indicator lamp flashes and gives out an alarm sound of dripping.

The foregoing is merely illustrative of the present invention, and simple modifications and equivalents may be made thereto by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. An ion chromatograph intelligent eluent supply system which is characterized in that: the supply system comprises an leacheate bottle, an automatic flow path switching device, an on-line gas-liquid separator, a leacheate preheating device and a pump which are sequentially connected through a leacheate pipeline; the leacheate pipeline side between the automatic flow path switching device and the on-line gas-liquid separator is provided with a leacheate detection and early warning device; the liquid inlet side of the automatic flow path switching device is also connected with pure water, and the automatic flow path switching device is communicated with the leaching liquid bottle by default and can be controlled to be switched into communication with the pure water when needed; the automatic flow path switching device, the leacheate detection and early warning device, the leacheate preheating device and the pump are connected with a controller of the ion chromatograph; the leacheate detection and early warning device is a capacitive proximity switch, a photoelectric bubble sensor or an ultrasonic bubble detection sensor.

2. The ion chromatograph intelligent eluent supply system of claim 1, wherein: the leacheate detection and early warning device is a capacitive proximity switch, and the capacitive proximity switch senses the existence of leacheate by sensing the change of dielectric constant caused by the approach of the leacheate.

3. The ion chromatograph intelligent eluent supply system of claim 1, wherein: the leacheate detection early warning device is a photoelectric bubble sensor, a detected leacheate pipeline is positioned in the middle of the photoelectric bubble sensor, the existence of liquid in the leacheate pipeline and the existence of bubbles generate different induced current magnitudes at the base electrode of the photoelectric triode at the rear end, and the existence of liquid in the leacheate pipeline and the existence of bubbles are judged through the processing of the controller.

4. The ion chromatograph intelligent eluent supply system of claim 1, wherein: the leaching liquid detection and early warning device is an ultrasonic bubble detection sensor, and the ultrasonic bubble detection sensor utilizes the fact that acoustic impedances of ultrasonic waves in liquid and gas are different, so that identification and detection of bubbles or liquid are achieved.

5. The intelligent eluent supply system for an ion chromatograph according to any one of claims 1 to 4, characterized in that: the leaching liquid pipeline is a pipeline made of polytetrafluoroethylene materials.

6. The ion chromatograph intelligent eluent supply system of claim 5, wherein: the controller judges that the ion chromatograph normally operates when the leacheate pipeline is full of liquid according to signal feedback of the leacheate detection early warning device; when judging that the liquid in the leaching liquid pipeline is absent or bubbles are detected, the controller controls the automatic alarm and controls the ion chromatograph to automatically enter a protection state, and after a delay of a few minutes, if the leaching liquid in the leaching liquid pipeline is not recovered to be normal, the controller automatically stops the operation of the pump and the leaching liquid preheating device and stops the power on of the inhibitor of the ion chromatograph.

7. The ion chromatograph intelligent eluent supply system of claim 6, wherein: when the controller controls automatic alarming, the alarming indicator lamp flashes and gives out an alarm sound of dripping.